Marine Hydrodynamics Quick Reference Guide

Marine hydrodynamics focuses on the behavior of water (and occasionally other marine fluids) interacting with submerged or surface-piercing bodies—such as ships, submarines, offshore platforms, propellers, and mooring systems. Its foundation lies in the Navier–Stokes equations, adapted for incompressible flow, turbulence modeling (e.g., RANS, LES), and free-surface dynamics governed by the kinematic and dynamic boundary conditions at the air–water interface. Key phenomena include resistance (frictional, pressure, wave-making), lift and cavitation on hydrofoils and propellers, maneuvering forces (added mass, damping), seakeeping (heave, pitch, roll responses to waves), and vortex-induced vibrations (VIV) in current-dominated environments. Practical implementation relies heavily on dimensional analysis (e.g., Froude, Reynolds, and Cavitation numbers), model-scale testing (towing tanks, cavitation tunnels), and high-fidelity CFD simulations validated against experimental benchmarks. The guide synthesizes these elements into accessible rules-of-thumb, scaling laws, coefficient correlations (e.g., ITTC 1957 skin friction line), and diagnostic criteria for common failure modes like broaching, parametric rolling, or propeller erosion.